What was found
THE AIRCRAFT BEHIND NOTICED A FIRE FROM THE NR 2 ENGINE. THE ENGINE WAS SHUTDOWN WITH NO ONBOARD FIRE INDICATIONS ALERTING. NO FURTHER SMOKE OR FLAME WAS NOTED AFTER SHUTDOWN. THE NR 1 ENGINE HAD BEEN STARTED NORMALLY WITHOUT INCIDENT. THE NR 2 ENGINE WAS STARTED AT THE GATE AND UPON LIGHT OFF, A CONTINUOUS 10-12 FOOT FLAME WAS OBSERVED FROM THE EXHAUST. THE ENGINE WAS SHUTDOWN AT 36% N2, 7% N1, AND A MAX EGT OF 412F. CORRECTIVE ACTION: MAINTENANCE FOUND EPCS MESSAGE S 275-19. PERFORMED FIM 71-01-00 815-802-P00 AND GOT EPS MESSAGE 275-25. THE NR 2 ENGINE EEC WAS REPLACED, PER B757 AMM 73-21-04. TESTS WERE GOOD, ENGINE IDLE RUN WAS NORMAL, ALL INDICATIONS WERE NORMAL, AND NO FLAMES FROM THE EXHAUST OCCURRED. THE AIRCRAFT HAS BEEN RETURNED TO SERVICE.